Liquid cooled lamp mount having one lamp terminal insulated from the cooling medium



Dec. l1, 1951 J. s. FRANKLIN 2,578,415

LIQUFD COOLED LAMP MOUNT HAVING ONE LAMP TERMINAL INSULATED FROM THE COOLING MEDIUM Filed June 4, 1948 2 SHEETS--SHEET 1 Inventeur'. John S. PanKln:

Hisr Attorney.

Dec. 11, 1951 J. s. FRANKLIN 2,578,415

LIQUID cooLED LAMP MOUNT HAVING UNE LAMP TERMINAL INSULATED FROM THE COOLING MEDIUM Filed June 4, 1948 2 sHEETs-sHEETz Inventor` John' 5.`Frank|n,

Patented Dec. 11, 1951 LIQUID COOLED LAMP MOUNT HAVING ONE LAMP TERMINAL INSULATED FROM THE COOLING MEDIUM .lohn S. Franklin, West Lynn, Mass., assignor to General Electric Company, a corporation of New York Application June 4, 1948, Serial No. 31,187

1 My invention relates to liquid cooling apparatus for electric lamps of the elongated high intensity type, more particularly my invention relates to a new and improved liquid cooled mounting arrangement for such lamps.

The primary object of my invention is to provide an improved liquid cooling mounting arrangement in which, in addition to having one terminal of the lamp insulated from the cooling medium, the lamp can be very easily replaced by another similar lamp, without breaking any joint that is not adapted by its nature to be broken.

Another object of my invention is to provide an improved liquid cooling mounting arrangement in which, a transparent, translucent, or fluorescent glass velocity tube can be very easily removed or replacedby the same or similar tube inherently separable by its nature.

Still another object of my invention is to provide an improved liquid cooling mounting ar- 1 rangement in which, the transparent, translucent, or fluorescent glass jacket can be very easily removed or replaced by the same or similar jaclet by unscrewing same from its main suppor Screwed joints (stoppered joints, and the like) are typical of joints adapted to be broken; soldered, welded, or cemented joints are typical of joints not adapted to be broken.

According to my invention, I provide a liquid cooling mounting arrangement for an elongated high intensity lamp comprising, generally, a metal base having suitable passages therein for the ingress and egress of the liquid coolant. The base serves as the main support for a demountable water-tight jacket which may be of transparent, translucent or uorescent glass or a plastic, suitable sockets for the support of the tube in coaxial and radially spaced relation thereto, a so-called lvelocity tube made of any ofthe materials recited above mounted in coaxial and radially spaced relation intermediate the lamp and jacket and being demountably connected to said base in such a manner as to allow the flow of the coolant from the base past the tube and thence through the jacket which is connected to the passageway in the base for egress of the coolant. This arrangement permits any o f the components to be removed without disturbing the base, the water connections thereto or the electric connections, also supported bythe base.

For a better understanding of my invention reference is had to the following description and accompanying drawings in which: Fig. 1 is a lon- Claims. (Cl. 240--11.4)

gitudinal sectional view of a device according to my invention; Fig. 2 is an end view of the device; Fig. 3 is a longitudinal sectional view of another embodiment of my invention; and Fig. 4 is an end view of the device of Fig. 3. i

Referring now more particularly to Figs. 1 and 2, I provide, in this particular embodiment, a composite supporting structure comprising a supporting base support block IIJ on which is supported a super-structure II having intermediate said last-named parts a rubber gasket I2 -for maintaining a watertight connection. The members IU and II are held tightly together by a metal bail member I3, the arms of which are secured to the opposite sides of the base I0 by means of screws I3A. Through the center of the bail, I provide a threaded thumb screw I5 which passages in the member II are connected to a pair of annular recesses ZIJ-2l in the member II. Intermediate the recesses 2li-2| is a raised annular portion 22 suitably threaded to engage a tubular member 23 which serves to conduct the incoming coolant from the passageway I9. Upon the unattached end of the tubular member 23, lI mount a so-called velocity tube or ow tube 24 made of any of the transparent materials here-` inbefore mentioned, the conguration of which is such asto increase the velocity of the flow of liquid in contact with an elongated high vapor pressure tube 25.` Preferably this member is made of quartz, but other. material such as transparent, translucent, or fluorescent glass or plastic might be used. If desired, of course, the tubular member 23 may be formed of a transparent material and shaped at its outer end to constitutel a ow tube, or the entire tubular structure 23, 24 may be otherwise integrally formed with the outer end portion provided with a suitable transparent window.

The lamp is supported in coaxial and radially spaced relation to said velocity tube between'a pair of resiliently mounted sockets 25 -2'I, the' iirst of which is resiliently supported by a cap 28 cemented or soldered to the open end of `a' jacket 29 composed of, for example, transparent,- translucent or fluorescent glass or plastic. The other socket is resiliently supported within the hollow portion 30 of an electrically conductive rod 3l which in turn is supported by an insulating member 32. The solid portion of the rod 3| is of appreciably smaller diameter than the outer diameter of the hollow portion and forms a shoulder at the junction of these dissimilar diameters. The member 3| is secured to the insulating member 32 by a threaded metal bushing 3|A. A rubber washer 32A serves to avoid any liquid leakage from this source. The insulating member 32 is hollowed out to provide a slidable fit for the socket 21 and hollow portion 30 of the conducting rod 3|. The portion 33 of the insulating member 32 is externally threaded so as to engage and be supported by the internally threaded right-hand end portion of the member Il.

A rubber gasket 34, disposed between an annular shoulder 35 integral with the insulating member 32, serves to provide a water-tight connection between said insulating member and the member Il.

The opposite end of the insulating member 32 isv provided with a flared opening 35 to accommodate a water-tight bushing 31, for` example, one composed of silicone rubber to resist the eX- tremely `high temperatures of the lamp 25, and is arranged to provide a liquid-'tight lit between said flared opening 35 and 'the terminal 38 of the lamp. This arrangement provides a stopperlike action which is exceptionally liquid-tight.

An electrically conductive cap 39 with an insulating covering 39a serves to conduct the current through the bushing Sla. the rod 3l. thence through the lamp 25 and the other terminal @il of said lamp which is resiliently supported by the socket 26. To the socket 26 is connected a second conducting member 4l which is disposed adjacent the jacket 29 and connected to a metal ferrule 42 securely cemented or soldered to said jacket. The open end of the ferrule d2 is threaded for engagement with an internally threaded annular shoulder 43 integral with the super structure l l. This last-namedarrangement completes the current carrying circuit through the member Il. the bail I3 and the base I ll to the ground point 44.

YThe simplicity with which the lamp may be disassembled with a readily appreciated. Thus, if vthe lamp 25 should fail, one simply removes the jacket 29 by unscrewing same from the supporting member Il, having rst de-energized the lamp and shut off the water supply or other source of coolant. The lamp is then removed from the flared end 36 of the socket support in the manner of removing a stopper from a bottle. The bushing 3'! is removed and placed over the terminal of a new tube and .both reinserted in the ared end 3E of said support.

As in the above manner. .any of the ccmponents may be dismounted for replacement or inspection without disturbing. the base, water or electric connections. It is only necessary to remove the high potential connector 39 if socket 42 Yor any of its associated parts are damaged.

Figs. 3 and 4 respectively illustrate a modification of the single-ended cooling mount of Fig. 1. In this arrangement, the supporting structure is 'a single member y54 having a pair of threaded apertures {i5-56, respectively, for the ingress 'and egress of the liquid coolant. This serves to reduce the chances of liquid leakage, eliminates several parts, and reduces the overall weight and size of the cooling mount. In all other respects this modification is similar to the cooling mount shown in Fig. 1.

The embodiments of my invention which I have described and illustrated were selected for the purpose of setting forth the principles involved. It will be obvious Athat the invention may be modified to meet various conditions and it is, therefore, intended to cover by the appended claims all such modications which fall within the spirit and scope of my invention.

What .I claim as new and desire to secure by .Letters Patent ofthe United States is:

1. In a liquid cooling apparatus for an electric lamp having a tubular envelope and contact terminals at opposite ends thereof, the combination comprising a supporting block having formed therein spaced apart entry and exit passageways for cooling fluid, a transparent tubular jacket having an open end and a closed end, means for removably attaching said jacket to said block at the open end of said jacket with said open end in communication with one of said passageways, an open-ended tubular member mounted upon said block with one end in communication with the other said passageway and the other end protruding into said jacket in concentric relation therewith, a hollow supporting rod of insulating material mounted on said block and extending partially into said tubulary member from the mounted end thereof, a lamp socket slidably mounted within said hollow rod, and means for sealing the protruding end of said hollow rod to a tubular lamp envelope having one contact terminal disposed in said socket.

2. In a liquid cooling apparatus for an electric lamp having a tubular envelope and contact terminals at opposite ends thereof, the combination comprising a supporting block having formed therein spaced apart entry and exit passageways for cooling fluid, a transparent tubular jacket having an open end and a closed end, means for removably mounting said jacket upon said block at the open end of said jacket with said open end in communication with one of .said passageways, an open-ended tubular member mounted upon said block with one end in communication with the other of said passageways and the other end protruding into said jacket in concentric relation therewith, said tubular member closing direct communication between the open end of said jacket and said other passageway, a transparent flow tube xed to the protruding end of said tubular member within said jacket, a hollow supporting rod of insulating material mounted on said block and extending through said tubular member and into said iiow tube, a rst lamp socket slidably mounted within said rod, means for sealing the protruding end of said hollow rod to the tubular envelope of a lamp positioned within said flow tube member, and a second lamp socket fixed to the closed end of said tubular jacket.

3. In a liquid cooling apparatus for an electric lamp having a tubular envelope and Contact terminals at opposite ends thereof, the combination comp-rising a supporting block having formed therein spaced apart entry and exit passager-'Jays for cooling fluid, a transparent tubular jacket having an open end and a closed end, means for' removably mounting said jacket upon one side of said block in end-wise projecting relation therewith and with the open end of said jacket in communication with one of said passageways, an open ended tubular member mounted interiorly of said block with one end in communication with the other of said passageways and the other end protruding into said jacket in concentric relation therewith, said tubular member closing direct communication between the open end oi said jacket and said other passageway, a transparent now tube xed to the protruding end of said tubular member and positioned within said jacket, a hollow supporting rod of insulating material removably mounted upon the other side of Vsaid block and extending through said tubular member into said now tube, a lamp socket slidably mounted within said hollow rod, and a resilient bushing for sealing the protruding end of said hollow rod to the tubular envelope of a lamp positioned within said flow tube.

4. In a liquid cooling apparatus for an electric lamp having a tubular envelope and contact terminals at opposite ends thereof, the combination comprising a supporting block having formed therein spaced apart entry and exit passageways for cooling uid, a transparent tubular jacket having an open end and a closed end, means for removably mounting said jacket upon said block at the open end of said jacket with said open end in communication with said exit passageway, an open-ended tubular member mounted upon said block with one end in communication with said entry passageway and the other end protruding into said jacket in concentric relation therewith, the protruding end of said tubular member being transparent and having a portion of reduced cross section centrally positioned in said jacket, a hollow supporting rod of insulating material mounted upon said block and extending into said tubular member toward said reduced end portion, a lamp socket resiliently and slidably mounted within said rod, and a resilient bushing member positioned in the open end of said rod for sealing said open end to the tubular envelope of a lamp positioned within the reduced open end of said tubular member,

5. In a liquid cooling apparatus for an electric lamp having a tubular envelope and contact terminals extending axially from opposite ends thereof, the combination comprising a supporting block having formed therein spaced apart entry and exit passageways for cooling fluid, a transparent tubular jacket having an open end and a closed end, means for removably mounting said jacket upon one side of said block in endwise relation with the open end of said jacket in communication with said exit passageway, an open ended tubular member mounted upon said block with one end in communication with said entry passageway and the other end protruding into said jacket in concentric relation therewith, the protruding end of said tubular member including a transparent portion of reduced cross section centrally positioned within said jacket, a hollow sup-porting rod of insulating material removably mounted upon the other side of said block and extending through said block and into said tubular member in concentric relation therewith to a position adjacent said reduced end portion, a first lamp socket slidably and resiliently mounted within said hollow rod, a second lamp socket resiliently mounted upon the closed end of said tubular jacket, and a resilient bushing positioned in the open end of the hollow rod for sealing between said open end and the transparent envelope of a lamp positioned within the reduced end of said tubular member.

JOHN S. FRANKLIN.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 2,275,739 Dellian et al Mar. 10, 1942 2,295,046 Noel Sept. 8, 1942 2,336,525 Bourne et al Dec. 14, 1943 2,445,313 Cosmetto July 20, 1948 

